<html lang="en"><head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
      * {
        padding: 0;
        margin: 0;
      }
      html,body {
        width: 100%;
        height: 100%;
        display: flex;
        justify-content: center;
        align-items: center;
      }
      .wrapper{
        width: 100px;
        height: 100px;
        background:lightblue;
        border-radius:50%;
        border:2px solid lightgreen;
        position: relative;
        /* top:200px;
        left:400px; */
        cursor:pointer;
      }
      .wrapper:after{
        content: '你猜';
        display:inline-block;
        width:100px;
        height:100px;
        line-height:100px;
        border-radius:50%;
        text-align:center;
        color:#fff;
        font-size:24px;
      }
      .wrapper:hover .round{
        -webkit-transform:scale(1);
        opacity:1;
        -webkit-animation:rotating 6s 1.2s linear infinite alternate;
      }
      @-webkit-keyframes rotating{
        0%{
          -webkit-transform:rotate(0deg);
        }
        100%{
          -webkit-transform:rotate(180deg);
        }
      }
      .round{
        width:240px;
        height:240px;
        border:2px solid lightgreen;
        border-radius:50%;
        position: absolute;
        top:-70px;
        left:-70px;
        -webkit-transition:all 1s;
        -webkit-transform:scale(0.35);
        opacity:0;
      }
      .round span{
        width:40px;
        height:40px;
        line-height:40px;
        display:inline-block;
        border-radius:50%;
        background:lightblue;
        border:2px solid lightgreen;
        color:#fff;
        text-align:center;
        position:absolute;
      }
      .round span:nth-child(1){
        right:-22px;
        top:50%;
        margin-top:-22px;
      }
      .round span:nth-child(2){
        left:-22px;
        top:50%;
        margin-top:-22px;
      }
      .round span:nth-child(3){
        left:50%;
        bottom:-22px;
        margin-left:-22px;
      }
      .round span:nth-child(4){
        left:50%;
        top:-22px;
        margin-left:-22px;
      }
    </style>
  </head>
  <body>
  
    <div class="wrapper">
      <div class="round">
     <span>1</span>
     <span>2</span>
     <span>3</span>
     <span>4</span> 
      </div>
    </div>
    
  
  </body></html>